Abstract
Illustrated descriptions of two new nematode species, Amphimonhystrella tropica sp. n. and Oncholaimus mekongis sp. n., found in the mouth of the Mekong River (Vietnam) are given. А. tropica is close to A. major Gagarin, Nguyen Dinh Tu, 2021 and A. paramonovi Phan Ke Long, Nguyen Dinh Tu, Gagarin by body size. It differs from first species in pharyngostoma shape, thiker body, longer tail and spicules, and absence of posterior uterus sac. It differs from second species in thicker body, longer spicules and another gubernaculum structure. Daptonema paramonovi Phan Ke Long, Nguyen Dinh Tu, Gagarin, 2020 is transferred to the genus Amphimonhystrella Timm, 1961: A. paramonovi (Phan Ke Long, Nguyen Dinh Tu, Gagarin, 2020) comb. nov. Dichotomy and pictorial keys for the identification of males of valid species of the genus Amphimonhystrella are given. Oncholaimus mekongis sp. n. is close to O. balli (Kreis, 1934) and O. menzeli Schneider, 1973 by body size and spicules length. It differs from both species in the presence of big spiny seta before to cloaca, position of ventral papillae at tail of males, thicker body, shorter outer labial setae and longer and slender males tail.
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